Granted Patent
Utility
US 6,409,921 · App. 09/463,316
Integrally asymmetrical polyolefin membrane for gas exchange
Inventors:
Marcus Müller, Erich Kessler, Ralf R. Hornscheidt, Frank Wiese, Armin Lang
Patented Case
View Patent ↗
Granted: Jun 25, 2002
Filed: Feb 28, 2000
Inventors
Marcus Müller
Erich Kessler
Ralf R. Hornscheidt
Frank Wiese
Armin Lang
Assignee (at issue)
Membrana GmbH
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.